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Teams and Outlook are not allowing login on iOS and\or Android

Garcia, Alfredo 30 Reputation points
2026-04-30T22:11:08.1733333+00:00

I'm seeing as of yesterday or the day before that we have received multiple tickets of users reporting they can't login into Teams or Outlook mostly being the issue. 1 case the user couldn't log into any apps and some other case they couldn't even log into Company Portal on their mobile phone.

We tried the basics of rebooting the phone after doing a Company Portal sync but had no luck.

Then we tried to unenroll the phone and delete the phone from Intune. If we can we delete the phone from Intune and Entra by going in the Company Portal app and clicking remove. This deletes it from Entra and Intune. Then we update the OS and we re-enroll. I'm wondering if Microsoft is going to publish an outage for Outlook\Teams mobile issues because I look in Intune and it says "Healthy."

Outlook | Outlook for mobile | Outlook for Android | For business
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Answer accepted by question author

Teddie-D 17,315 Reputation points Microsoft External Staff Moderator
2026-05-01T02:25:37.65+00:00

Hi @Garcia, Alfredo 

Could you test signing in on a new or unmanaged device to help determine whether the issue is device-related or caused by tenant policies such as Intune App Protection, Conditional Access, or compliance settings? 

Based on the symptoms described, this does not strongly indicate a current Intune service outage, especially if Intune Service Health is reporting as Healthy, although Microsoft 365 authentication-related advisories should still be reviewed. 

Given the behavior (multiple apps affected, including Outlook, Teams, and Company Portal), this scenario is more commonly linked to Intune App Protection Policy (MAM) enforcement or device/app compliance requirements, rather than a backend service availability issue. 

For mobile scenarios: 

On Android, Microsoft documents that the Intune Company Portal app is required for Microsoft 365 apps such as Outlook and Teams to receive and enforce App Protection Policies (APP/MAM). Access to organizational data can be blocked if the required conditions are not met, even while the service itself remains healthy. 
Reference: Android App Protection Policy Settings - Microsoft Intune | Microsoft Learn.

This means users may be unable to sign in to Outlook, Teams, and in some cases Company Portal itself when: 

-Required apps (Company Portal, Authenticator, Outlook, Teams) are outdated. 

-The device is not properly registered in Microsoft Entra ID. 

-App Protection Policy validation fails. 

-Conditional Access or compliance requirements are not met. 

In these cases, sign-in may fail across multiple apps, and re-enrollment may only provide temporary relief if the underlying compliance or app version requirement is still not resolved. 

-Ensure Company Portal, Outlook, Teams, and Microsoft Authenticator are updated to the latest versions on affected devices 

-In Intune Admin Center > Apps > Monitor > App protection status, check for: 

  • Blocked app launches 
  • App version requirements not met 

-Review App Protection Policies, Conditional Access policies, and compliance policies for any recent changes affecting mobile devices 

-Confirm affected devices are: 

  • Properly registered in Microsoft Entra ID 
  • Compliant in Intune 

Please note that this is a user-to-user support forum. Moderators, contributors, and external Microsoft employees do not have access to backend systems or diagnostic logs. Our role is limited to sharing technical guidance based on publicly available information and experience. 

To investigate further, we recommend submitting a support request through the Microsoft Intune admin center. For further instructions, you can follow this guide: Get support in the Microsoft Intune admin center - Microsoft Intune | Microsoft Learn.   

Thank you for your patience and understanding. 

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread. 

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  1. Garcia, Alfredo 30 Reputation points
    2026-05-01T19:57:26.9833333+00:00

    Thank you Teddie-D. That was helpful.

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  2. AI answer

    2026-04-30T22:11:24.0166667+00:00

    This pattern matches known mobile issues rather than an Intune service health problem.

    Based on similar recent cases, there are two main angles to check:

    1. Rule out a device‑side regression (Android) On affected Android devices, a WebView regression can break Microsoft apps (Outlook, Teams, sometimes Company Portal) without any Intune or service health alert. The recommended fix is:
      1. On the device, go to Settings → search for “Android System WebView” → App details in store → Remove updates.
      2. Reboot the device.
      3. Go back to Android System WebView → App details in store → Update.
      4. Reboot again, then launch Teams/Outlook and sign in.
      5. If “Android System WebView” is not visible under Apps, use Settings → Google → All services → System services → Android System WebView and then follow the same remove‑updates / update steps.
      This has been confirmed to resolve cases where Outlook and Teams suddenly stopped working on Samsung devices after a security update, even though Intune and Microsoft 365 service health showed as healthy.
    2. Standard Outlook/Teams mobile sign‑in troubleshooting For users who still cannot sign in after the WebView fix (or on iOS):
      1. Verify whether the account is a Microsoft personal, work/school (Microsoft 365), or non‑Microsoft account and follow the appropriate path:
        • For Microsoft personal accounts, use the sign‑in helper tool referenced in “Can’t sign in to the Outlook mobile app” to detect and fix account issues.
        • For Microsoft 365 work or school accounts, if self‑service password reset is enabled, direct users to the Reset password link; otherwise, reset via admin.
        • For non‑Microsoft accounts (Gmail, Yahoo, iCloud), the mail provider must resolve sign‑in issues.
      2. If Outlook/Teams apps are crashing or stuck:
        • Clear the app cache (platform‑specific) and reinstall the app.
        • Ensure the device meets minimum requirements, has enough storage, and has a stable data/Wi‑Fi connection.
      3. If a device is fully blocked from signing in (including Company Portal) and is enrolled:
        • Confirm device date/time is correct.
        • If necessary, unenroll and re‑enroll:
          • Remove the device from Intune/Entra.
          • On Android, if Company Portal is stuck due to device admin, remove it as a device administrator (Settings → Security / Security & privacy → Device admin apps → clear Company Portal), then uninstall and reinstall Company Portal and re‑enroll.
    3. When to suspect Conditional Access / compliance If only some users/devices are affected and they are blocked at sign‑in or in loops while Intune shows healthy, check:
      • Conditional Access policies (sign‑in frequency, device compliance requirements) that might be newly applied to mobile apps.
      • Device compliance status in Intune; non‑compliant devices can be blocked from getting tokens.
    4. Service health / outage expectation The referenced cases were caused by client‑side or policy issues (WebView regression, MFA/CA problems), not a global Microsoft 365 or Intune outage, so no service health incident was posted. If Intune and Microsoft 365 service health dashboards show “Healthy” and the WebView and policy checks resolve the issue, it is not treated as a cloud outage.

    In practice, for the current tickets:

    1. Apply the Android System WebView rollback/update fix on affected Android devices.
    2. For any remaining failures, follow the Outlook mobile sign‑in guidance and, where needed, reset passwords or MFA/Conditional Access settings.
    3. Use unenroll/re‑enroll plus Company Portal device‑admin removal only as a last resort when the app itself is blocked.

    References:

    AI-generated content may be incorrect. Read our transparency notes for more information.

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